AMD Thunderbird 1ghz, 256mb RAM, GF4 Ti 4200 (currently broken, no 3D works anymore)
OS's
Linux Mandrake 9.1: everyday use, gaming
Windoze 2000 Pro: previously my primary OS, now just used for gaming once in a while and producing music + the occasional stuff that can't be done in Linux
BeOS dano: for playing around with

Amithlon: hmm, nothing at the moment, haven't gotten around to adding it to Lilo, so it has to boot the kernel from CD. Also, it's no longer net'ed because the NE2k compatible NIC i had was crap for gaming (on the other OS's) so i put it into my mothers old P200.
Also,
zeta (BeOS R6) will definitely have a place on this box when it is released, and AROS, once it is usable and maybe another Linux distro or FreeBSD or whatever
.... and
ReactOS :-D